Lifting-jack.



WILL-1AM Esme ALL EO; or refineries,M CHIGAN; Assiero-nf'ro HANDY :r Acie" MANUFACTURING CQMPANX or camera, F'LAMBTO eouNTr, on mmo omaml- L IETINGJACTKUf To' all w hom' 'it may conc'ernfl r i one, of PortHu'ronfi'ntheState of Michi gan, United States of America,-. have 1 in vented certain new and useful Improvements in Lifting-Jacks, of wh1ch7thefoll0w1ng-1s a specification.

My invention relates to --impr0venients in lifting j acks, for general purposes,- and the objects of my invention are to provide; an; exceedingly simple-and easily-operated def-s vice whichmight be used fora great variety; ofpurposes, and which will, on :reeiproc aes tinn of a lever, either raise or lower the loadby a step-by-step movment, the details'of: the inventionend' the specific features of" novelty therein-being hereinafter set {forth and described in theaccompanying specificaa' tion and drawing'sg w In the'd'rawings Figure 1-;is an elevation of one side of the'lifting-jack; Fig. 24s an a elevation of the reverse side.- Fig: 3 is a vertical section "along' tli'etline2 2; Fig. 1-.

Fig. .4 is a sectional" detail through the-ad.-

justable head. 5 is a sectirinon the linefl 3- 3', Fig. 4. Fig. f6 isfa, sect/ionaldetml of. the lower ,engaging member. Fig? *is" a.

sectional detall along the"line4-I-4a, Fig- 6. In the "drawings, likeletters of reference indicate correspondingparts In each figure:

Referring to the drawings," A represents e the shank of suitable form provided with a base 10, which'may be detachably connected- .tliereto, this, in theembodimentillustrated, being accomplished by the formation of a; socket-11 in the baseyinto'which theendof the shank extends being retained thereinsb aboltl2. I I} of. the load. Itwilljb'e observed that] this the beam, post or other articlewhichis beingenga'ged and raised by thej'projeetion.

C represents the operatinghandle which is preferably formed with aywooden shankand a metallic head 16 which latter is pivoted to the head, as by means of a trunnion l7 f0rmed w I I T 'thesis1,te thing;thtiig t jiiiijhead Be it known that 1; WILLIAM- EDWARD ALL-u l the engaging me mber If thtough't'he in'edi pf the eon, 1l, ,tlie I pivotal con jtween the" leyer andithe link]; Fefi'ected through the m ediium"of1 forined on the lever; which jfiexten s'sl d b 10 1.... .v pt d t q n p mtfw h t th a'dtol fl scribed. To iurther assist the 'stp-by; fstep ithe head e dr e a ing' memb warm i p th i es ek xid pr ntfl etre' Tliedogf221oc ated. in the 'head ifs essay withteeth .23 adapted {to engage t,h;e. side jofside of z-theshanlnd e I it -To 'releasje}the dog;, 1ever28;is provided v I V being connected toaipini29'forr'ned on one Sliclably mounted'on the'shankis the headu B which has a projection 13 on onelside 7 thereof formed'onits upper edge with eng'aging ribs 14 serving to prevent. slipping 7 when the projection is engaged with'theside .ment with the side ofthe shank. The dog 33 on the engaging. member is formed with like grippingiteeth 34; and is located in arecess 35 and normally pressed outwardly by r aspring'35', thesaid dog being adapted. to be retracted by means' of a lever 36 conretained in-position, by ra g l3v g j gw the extremity th f i v site en'd of which has'pivotaiconnection nectionl th n li and t l formed in thehead; "l

djonl'the shank the step-by-st'epmovement as hereinafter grade movement.

the shank,' and an inelined rear surface which engages. a orrespond nglyi incl ned surface 25. townsh onstiit'tites jthe" bottoinfoff l a recejssfZG]withinfwhieht thejdogiisf l'oeated; 1 T he sai dog be i orm i i pi iii 3 63 1 Q Ja iC mpre l lsion spring 271 t nl h 's1dlot-thdb' and the side of the; recess," The teethforine on thedog are so designed that jtlieyfwillf I prevent backward or. retrograde movement f and the spring coraetswith'theinelinedsur- I aces tonormally jlfor cethe' teeth'againstthe tlieheadzwhereby whenthe [lever isfltilte'd -upwardly-,,; the PinjQQfiVill be forced; down, carrying the" teeth and dog out of engage iieeted to a pin 37 which extends through a' slot 38 in the side of the engaging member. 'lo release the dog 13,:the end of the lever -36 is pulled outwardly causing the pin 37 to g-vided, exten, ing between a projection tl) on slide in the slot 38, and bringing the teeth 34 out of engagement with the shank.

To retain the link bar I) in position and "assist the step-by-step movement of the head and engagin member, a spring 39 is prothe engaging member and an arm 41 formed integral with-the end of the'link and ext'ending from a lower pivotingpoint there-' on. 1n order that additional support may be conveniently provided for the shanlcin case ofheavy loads, aremovabletop niemif; "her F is provided having a slot 42 therein,

into which the end 'of the shank fits'rbeing detained therein by a bolt 43 and'in order to enable the device to be used conveniently Kto'ti hten fence wires, wire grips are provide on the member F and on the head, that pivoted on the bolt 43 having teeth 45 adapt-' on the member-F consisting of a' lever 44 df 'to' en'ga'ge corresponding teeth 46 prolever 48. having teethAQengaging like teeth j ackjto be like purposes, av pair of tongs G are provided havin an-oval member 51 at their top vwhichus adapted to engage with a book 52 formed on the extremity of the proj jeotion 13. 35

\ In o eran njto raise the head on the 1 qshank't e operating lever C isrecip'rocated/ I 7 Eachtiine 'itisraised, the engaging member -1s raised through the medium of the link bar 'D, this bein "assisted by the action of thespring 39 an each time the lever is lowcred, thevdog :33, preventing downward movement of the en aging member, causes the head to be move upwardly. To lower the load, the spring dogs 22 and. 23 are alternately released and the load allowed to lower under the action of gravity by a stepby-step movement. When 1 used as a wire stretcher, the wires are engaged in the wire gripping means hereinbefore described and on a reciprocation of the operating lever C will be drawn closer together. It will be observed that the provision of-the spring. dogs.

- on the head and on the engaging member antomatically locks these'members in adj usted position in such a manner, however, that they are free to move'upwardly when acted on by the lever.

As manychanges could be made in the above construction and many apparently widely different embodiments of my invention could be made without departing from the spirit or scope thereof, it is intended thatall'matter contained in these specifications and drawings shall be interpreted as.

illustrative-and not in a limiting sense; it is also to be understood that the language of the following claims isintended to cover such generic and specific features of the invention herein described which, as a matter of language might be said to be included thereby.

What I claim as my invention is:

' '1. Ina tool of the class described, thev combination with the shank, head slidable thereon having a recess therein formed with an inclined surface, an engaging member, an operating lever on the head, means actuated by tilting thereof for edecting the step-by step movement between the head and the engaging member, of a spring-actuated do located within the recess in the head ant coact-ing-with the inclined'surface thereof to normally engage and grip the shank, a pin on the dog, extending normally to the head, a lever on said pin having a cam surface formed thereon and a projection on the head adapted to cotiperate with the cam surface to release the dog, when the-lever is tilted.

2. In a too] of the class described, the combination with the shank, the head and engaging member slidable thereon, a lcvcr pivoted to the head and means for causing reciprocation of the lever to impart a stepby-step movement to the head and engaging member, of a projection protrudin laterally from the head, the top surface of the projection' being some distance below the top of v WILLIAM EDWARD ALLGEO. Witnesses:

JENNIE MAITLAND, GEORGE S. CLARKE. 

